Dust-cleaning suction-pump



O. M. KENNEDY. DUST CLEANING SUCTION PUMP.

APPLICATION FILED MAR. 28, 19x9.

1,401,789. Patented Deu. '27, 1921 2 SHEETS-SHEET 1i av v ATTORNEY 0. M. KENNEDY.-

DUST CLEANING SUCTION PUMP.

APPLICATION FILED.MAR. 28, I919.

Patented Dec. 27, 1921.

2 SHEETS-SHEET 2.'

17 a 17 20' l J 3'1 IIIIVENTOR ATTORNEY STAFES rarest series- I OTIS KENNEDY, OB PHILADELPHIA, PENNSYLVANIA.'

DUST-CLEANING SUCTION-PUMP.-

To all whom it may concern:

Be it known that I, Orrs M. KENNEDY, a citizen of the United States, residing in the city of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Dust-Cleaning Suction- Pumps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, formin a part of this specification.

y invention has for its object to provide a comparatively small and manually operated suction pump especially adapted to clean the dust which commonly enters very small openings to tubular passages or ducts, such as the openings of the air pas sages of the tracker bar of a player piano, and to that end requires very close contact of the suction opening of the device with the terminal surface of the opening to be cleaned.

To operate effectively it should be a guided suction contact as the tracker bar has a rounded surface perforated by a horizontal series of duct openings. It is essential to the proper operation of such a dustcleaning suction. device, that additional means be provided to discharge the' dust ally apertured. Valvular means normally close this aperture, which is opened on the suction stroke. cap a guiding function it is provided on its face with a rounded groove or channel, extending from side to side, preferably adding an elongated slot at the base of and intermediate the length of the groove. To discharge the dust sucked into the cylinder, a'valvular device is mounted on the periphery of the cylinder, communicating directly with the interior of the cylinder, normally Specification of Letters Patent.

To impart to the contact closed, and operable only on the return strokeof the piston. My invention includes a specific and preferable construction of the dust-discharging valvular means, constructed and operating on that principle and comprising, in combination with the check valve as before stated, a spring-controlled tubular body closed at one end, and with. peripheral openings therein, slidingly mounted on a tubular member communicat- 111g at one end with said sliding member and at its other end communicating directly with the interior of the cylinderbody.

The device is simple and cheaply constructed, and most eiiicient in operation, the rounded groove or channel on the face of the contact cap operating to maintain the axially disposed suction aperture therein in alinement with the horizontally arranged line of ducts or openings in the periphery of the rounded tracker bar, without guid-. ance by the operator, while the resilient or yielding face of the contact cap maintains,

with the slightest pressure from the operator, so closea contact as to create a substantial vacuum back of it and in the barrel'between the check valve and the piston, resulting in easily and effectively sucking into the pump barrel, all dust which has entered through the perforations of the tracker bar and accumulated within the ducts and connecting tubes leading therefrom to the pneu matic devices of the instrument, and this without lifting the device from contact with the tracker bar until it has passed over the entire row of perforations or ducts therein,

Patented Dec. 2?, 1921. Application filed March 28, 1919. Serial No. 285,798; I

which are exceedingly small in area and frequently number asmany as 88 in bar of some 18 inches in length. I

In the'drawings illustrating my inventionfFigure 1 is an elevation and Fig. 2 a vertical section, of the simpler form of my device, and. Fig. 3 an elevation, Fig.4 a vertical section, and Fig. 5 top end view, of the modified and extended formvofthe, invention.

Referring now to said drawings, the .cylinder is indicated at 1, the plug endthereof, having the usual air outlets, is indicated at 2, the piston rod at 3, its'operating end at 4:, and the piston at 5. In the form shown in Figs. 1 and 2 of Sheet 1 the head end of, the cylinder is closed save that it is provided with a terminal nipple 6 which is centrally apertured at 7 The elastic head or contact cap 8 which in this embodiment of the in ventionis a molded block of comparatively soft rubber, is centrally apertured at 9 to conform in shape with and fit tightly over the nipple 6 and is additionally secured in place thereon by shellac or cement 10, between its base and the flat annular surface around the nipple. Proceeding concentrically from the aperture 9, and alining with the aperture 7 in the nipple, the elastic head is provided with a communicating opening 11 extending to the contact end 12 which may be flat as shown in Fig. 2; but in the modification shown in Figs. 3, 4c and 5 it is provided with a shallow rounded channel or concavity such as indicated at 18 for making closer contact with a rounded surface, and the concavity lined with felt or softwash leather also, if preferred, as shown in such modified form of the invention about tobe described.

Referring now to Figs. 3, 4c and 5, the cylinder, piston, piston rod and operating end of the latter, are the same as in the other form. The cylinder may have a grasping part 13 sleeved over it, if preferred.

In this form the cylinder end is open and is provided with an annular flange 14 on which is mounted the contact head or cap 8, but in this case the body head 8 may be rigid, say of wood, and the elastic part in the form of a thick facing of soft leather, indicated at 18, cemented to a transversely disposed rounded channel or concavity on the face of the head body 8; the latter being secured to the flange 14:, by suitable means such as by screws as shown. The channeled or concaved form of the face 18 of the contact head and its lining best illustrated in Fig. 5 isof special value in making sliding contact with the curved surface of the tracker bar of a player piano, and in this form of the contact face the opening 11 (see Fig. 5) may be lengthened to cover several duct openings to be cleaned. Between the cylinder head and the contact head or cap is mounted a check valve, shown in the drawings, Fig. 4, as a flap valve 15 swinging transversely to the direction of the,

length of the contact head, to open and close the intake opening therein. In a plane slightly below the permitted length of stroke of the piston, in the wall of the cylinder is mounted a dust discharging valvular device, consisting of the tubular member 16 within which is a coiled spring 17 held by a pin 17, the other end being fastened to head end of the member 19. The tubular member 16 is open at both ends, one end being mounted in the wall of the cylinder body and the other end, which is preferably flanged as shown, is normally covered by the tubular member 19 which is closed at its outer end, and is slidingly mounted on the fixed tubular member 16. The slidcylinder, such stroke of the piston opening the flap valve and closing it on the return stroke. Of course some other form of check valve could be used in the same way and with like results, in place of the flap valve, if preferred.

Having thus described my invention, I claim:

1. A dust-cleaning suction pump of the class described, comprising in combination, a cylinder, piston and piston rod, a suction nozzle, including means to secure it to the cylinder head, said nozzle having a yieldable contact face and an axially-disposed passage leading therefrom directly to the interior of the cylinder; valvular means operable to keep said passage normally closed and to open it by the uction strokeof the piston; and dust-discharging valvular means mounted on the periphery of the cylinder, normally out of communication with the atmosphere and operable to be opened by the return stroke of the piston to discharge the cylinder contents.

2. A dust-cleaning suction pump of the class described, comprising in combination, a cylinder, having a hollow nipple on its head end, a piston and piston rod, a suction nozzle, having a yieldable contact face, a recess on its under face adapted to register with and be secured thereby to said nipple and an axially-disposed passage leading therefrom directly to the interior of the cylinder; valvular means operable to keep said passage normally closed and to open it by the suction stroke of the piston; and dustdischarging valvular means mounted on the periphery of the cylinder, normally out of communication with the atmosphere and operable to be opened by the return stroke of the piston to discharge the cylinder contents.

3. In a dust-cleaning suction pump of the class described, comprising in combination, a cylinder, piston and piston rod, said cylinder including a suitable suction nozzle thereon, having an axially disposed passage leading directly to the interior of the cylinder; valvular means normally closing said passage and operable toopen it by the suction stroke of the piston; and dust-discharging valvular means normally out of communication with the atmosphere and operable only on the return stroke of the piston, said means comprising an open-ended tubular member fixedly mounted by one end in the peripheral wall of the cylinder, adjacent to the first mentioned valvular means, a tubular ca member sleeved on said fixed tubular mem er and slidable thereon, and a spring between said members operating to normally maintain them in relatively closed osition, said sliding member being annuarly perforated and movable by air pressure to open communication with theatmosphere.

4. In a dust-cleaning suction pump of the class described, comprising in combination, a cylinder, piston and piston rod, a suction nozzle on the cylinder head, said nozzle having a yieldable contact face and an axially disposed passage leading directly to the interior of the cylinder; valvular means adapted to normally close said passage and operable to open it by the suction stroke of the piston; and dust-discharging valvular means communicating directly with the interior of the cylinder but normally out of communication with the atmosphere, said means comprising an open-ended tubular member fixedly mounted by one end in the peripheral wall of the cylinder adjacent to the first mentioned valvular means, a tubular cap member sleeved on said fixed tubular member and slidable thereon, and a spring between said tubular members operating to normally maintain them in relatively closed position, said sliding member being annularly perforated and movable by air pressure to open communication with the atmosphere.

5. In a dust-cleaning suction pump of the clas described, in combination, a cylinder, piston and piston rod, a suction nozzle on the cylinder head, said nozzle having a yieldable contact face and an axially disposed passage leading directly to the interior of the cylinder; valvular means operable to keep said passage normally closed and to open it by the suction stroke of the iston; and dust-discharging valvular means comprising a fixed tubular member having an exterior annular flange, said member communicating directly with the interior of the cylinder, a slidable tubular member closed at one end and mounted sleeve-like on said fixed tubular member in manner to normally close the free end thereof, a spring between said tubular members operating to maintain them in relatively closed position, said sliding member being annularly perforated and movable on the fixed member by the return stroke of the piston to open com munication with the atmosphere.

In testimony whereof, I havev hereunto aflixed my signature this twenty seventh day of March A. D. 1919.

OTIS M. KENNEDY.

Witnesses:

I. M. Toms, ALEXANDER PARK. 

